Embedded

Rust supports a lot of processors other than x86 and ARM, and can be used to program embedded controllers for automobiles and IoT devices.

Xargo
"Xargo builds and manages 'sysroots' (cf. ). Making it easy to cross compile Rust crates for targets that don't have binary releases of the standard crates, like the  targets. And it also lets you build a customized   crate, e.g. compiled with, for your target."Xargo is now in maintenance mode. Work is in progress to incorporate its features into Cargo.

Cargo
The customize std feature of Cargo is under active development in the std-aware Cargo working group. The experimental implementation is in nightly under the flag.

Books

 * The Embedded Rust Book

Crates
The crates.io has No standard library and Embedded development categories.